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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 38 (Disc Brakes & Drum Brakes) >> Trouble Shooting >> Disc Brake System >> Brake Rotor Surface & Wear Inspection

Brake Rotor Surface & Wear Inspection

WARNING: This page is about a different car, the 2002 Pontiac Montana, 2002 Oldsmobile Silhouette, and 2002 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clean the brake pad lining contact surfaces of the brake rotor with denatured alcohol or an equivalent approved brake cleaner. Inspect the braking surfaces of the brake rotor for the following braking surface conditions: Heavy rust and/or pitting, light surface rust can be removed with an abrasive disc; heavy surface rust and/or pitting must be removed by refinishing the rotor. Cracks and/or heat spots and excessive blueing discoloration.
  2. If the braking surfaces of the brake rotor exhibits one or more of the braking surface conditions, replace the brake rotor. Using a micrometer calibrated in ten-thousands of an inch, measure and record the thickness variation of the brake rotor at 4 or more points, around the rotor. Ensure that the measurements are only taken within the brake pad lining contact area and that the micrometer is positioned the same distance from the outside edge of the rotor for each measurement.
  3. Compare the thickness variation recorded to the following specification. See DISC BRAKE SPECIFICATIONS  . If the brake rotor thickness variation exceeds the specification, the rotor requires refinishing or replacement.
  4. Using the micrometer, measure and record any grooves present on the rotor braking surface. Compare the scoring depth recorded to the following specification. See DISC BRAKE SPECIFICATIONS  .
  5. If the brake rotor scoring depth exceeds the specification and the rotor thickness in the grooves is greater than the minimum rotor thickness specification, refinish the rotor. See BRAKE ROTOR REFINISHING  under ADJUSTMENTS & INSPECTIONS. If the brake rotor scoring depth exceeds the specification and the rotor thickness in the grooves is less than the minimum rotor thickness specification, replace the rotor. See FRONT BRAKE ROTOR  under REMOVAL & INSTALLATION.
  6. Mount a dial indicator (J-8001) or equivalent, and position the indicator button so it contacts the brake rotor at a 90 degree angle, approximately 0.5 in. (13 mm) from the rotor's outer edge.
  7. Measure and record the lateral runout of the brake rotor. Rotate the rotor until the lowest reading is displayed on the indicator dial, then zero the dial. Rotate the rotor until the highest reading is displayed on the dial. Measure and record the amount of sealed wheel bearing play, then subtract the bearing play from the lateral runout recorded to obtain the true amount of lateral runout.
  8. Compare the lateral runout of the brake rotor to the following specification. See DISC BRAKE SPECIFICATIONS  . If the brake rotor lateral runout exceeds the specification, replace the rotor. See FRONT BRAKE ROTOR  under REMOVAL & INSTALLATION.
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